Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual dupla masculina foi mantida junto com o individual feminino de Camilla Martin?
 ###Tabelas: CREATE TABLE 180_nm (180_nm_id AUTO_INCREMENT PRIMARY KEY, Model Number VARCHAR, sSpec Number VARCHAR, Frequency VARCHAR, L2 Cache VARCHAR, Mult VARCHAR, Voltage VARCHAR, Socket VARCHAR, Release Date VARCHAR, Part Number(s) VARCHAR) CREATE TABLE bcs_standings (bcs_standings_id AUTO_INCREMENT PRIMARY KEY, Week 8 Oct 26 VARCHAR, Week 10 Nov 9 VARCHAR, Week 11 Nov 16 VARCHAR, Week 12 Nov 23 VARCHAR, Week 13 Nov 30 VARCHAR, Week 14 (Final) Dec 7 VARCHAR) CREATE TABLE past_winners (past_winners_id AUTO_INCREMENT PRIMARY KEY, Year INT, Men's singles VARCHAR, Women's singles VARCHAR, Men's doubles VARCHAR, Women's doubles VARCHAR, Mixed doubles VARCHAR) CREATE TABLE standings_pool_b (standings_pool_b_id AUTO_INCREMENT PRIMARY KEY, Skip (Club) VARCHAR, W INT, L INT, PF INT, PA INT, Ends Won INT, Ends Lost INT, Blank Ends INT, Stolen Ends INT) CREATE TABLE formation_of_the_1st_arkansas_state_troops (formation_of_the_1st_arkansas_state_troops_id AUTO_INCREMENT PRIMARY KEY, Company VARCHAR, Name VARCHAR, County VARCHAR, Militia Regiment VARCHAR, Commander VARCHAR, Organization Date VARCHAR)  
SELECT Men's doubles FROM past_winners WHERE Women's singles = camilla martin